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Segment Information - Revenues, operating profit, total assets, and long-lived assets for U.S. and non-U.S. operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 2,569.9 $ 2,307.9 $ 2,242.8
Operating profit (loss) 197.6 217.3 349.0
Total Assets 4,915.5 3,577.9 3,340.6
UNITED STATES      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 2,603.8 2,312.0 2,184.8
Operating profit (loss) 191.8 208.5 153.9
Total Assets 4,762.6 3,423.4  
Long-Lived Assets 2,024.9 1,241.2  
UNITED STATES | External      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 2,556.2 2,271.5 2,159.8
UNITED STATES | Intercompany      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 47.6 40.5 25.0
Non-US      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 91.5 98.8 199.1
Operating profit (loss) (1.1) 2.4 6.1
Total Assets 152.9 154.5  
Long-Lived Assets 104.5 95.1  
Non-US | External      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 13.7 36.4 83.0
Non-US | Intercompany      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 77.8 $ 62.4 $ 116.1